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Planning
• Keep data and signal lines separate from interference sources.
Route data and signal lines separately from all power supply cables and other sources
of high electromagnetic emissions (e.g., frequency converters or drives).
• Connect the cable shielding with the ground potential.
Integrated shielding is mandatory to meet technical specifications regarding measure-
ment accuracy. Establish the connection between the cable shielding and ground po-
tential at the inlet of the cabinet or housing. This grounding allows induced interfer-
ences to dissipate and be kept away from devices in the cabinet or housing.
• Improve shielding performance with a large contact area.
Greater shielding performance is achieved via low-impedance connection between
shielding and ground. For this purpose, connect the shielding over a large surface
area, e.g., using the WAGO 790 Shield Connection System. This is especially recom-
mended for large-scale systems where equalizing or high impulse currents may occur.
6.2 Power Supply Concept
6.2.1 Design Power Supply
NOTICE
!
Device damage if permissible current feedthrough exceeded
There is a risk of damage to the device and/or other devices connected to it if the maxi-
mum permissible current feedthrough is exceeded.
Power Supply of the Module and the Connected Sensors/Actuators
The 24 V power supply is fed in via the X31 (PWR IN) supply input. The module has two
electrically isolated supply cables.
• Supply cable 1 connects 1L+ (pin 1) to 1L- (pin 3).
• Supply cable 2 connects 2L+ (pin 4) to 2L- (pin 2).
The sensors or actuators are powered through ports X01, X02 etc. The design of the
power supply must take the demand of the connected sensors and actuators into ac-
count.
Successive devices can be powered through the X32 (PWR OUT) supply output. This
current feedthrough must also be taken into account in the design of the power supply.
Protective Functions
The module has integrated protective functions (see
prevent damage in overload situations such as overcurrent or short circuit. However, it is
important not to rely on these protective functions alone, but also to limit the currents ex-
ternally, because these protective functions do not cover the current feedthrough for pow-
ering successive devices through the supply output (X32). The maximum supply current
including the current feedthrough through X31 and X32 must be limited through fuse pro-
tection (see datasheet).
34
Product manual | Version: 2.0.0
8DIO FLD EC DC 24V 2.0A
765-1205/100-000
8 Overload protection
[} 28]) to
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